Photographic shutter.



No. 652,295. Patented June 26, I900.

' w. SHAKESPEARE, 1a.. a a. w. Law.

II. E. LOW,'Administratrix of 6.11. LOW, Dee'd.

PHOTDGBAPHIG SHUTTER.

(Application filed Doc. 1, 1899.)

Model.)

UNIT D STATES PATENT Er ca.

WVILLIAM SHAKESPEARE, JR, AND MARY E. LOW, ADMINISTRATRIX OF GARRETT IV.LOW, DECEASED, OF KALAMAZOO, MICHIGAN.

PHOTOGRAPHIC SHUTTER.

SPECIFICATION forming part of Letters Patent No. 652,295, dated. June26, 1900.

Application filed December 1, 1899. Serial No. 738,766. (Model-l To allwhom, it may concern:

Be it known that we, WILLIAM SHAKE- SPEARE, Jr. and GARRETT W. Low,(since deceased,) citizens of the United States, and residents ofKalamazoo, in the county of Kalamazoo and State of Michigan, haveinvented certain new and useful Improvements in Photographic Shutters,of which the followingis a full, clear, and exact description.

The invention relates to new and improved devices for connecting thepneumatic engine of the shutter with the shutter wings or slides,whereby the principle in mechanics known as the toggle-lever is availedof in such manner as to secure the positive action of the wings orslides both in opening and closing in a very satisfactory manner and bythe expenditure of less power by the engine than in any other way known,and the construction is such that the presence of any obstructivematerial--s'uch as corrosion of the part-s,dust, lint, and thelike-cannot interfere with the perfect operation of the apparatusbecause of the control that the engine has over the wings or slides byreason of the employment of the toggle-lever principle. Furthermore, theconstruction of the parts is very simple, inexpensive, and durable.

Figure 1 is a face view or elevation of a shutter embodying theinvention, the parts being in the positions they occupy when the shutteris in its primary or closed position. Fig. 2 is a face View or elevationof the de vices shown in Fig. 1, the parts being inthe position they.occupy when the shutter is open. Fig. Sis a face view or elevation ofthe parts shown in Figs. 1 and 2, the engine being shown partly insection, the parts being in the position they occupy when the shutterhas been opened and closedin other words, at the end of an instantaneousexposure. Fig. 4 illustrates an elevation of the reverse or inside ofthe shutter-case, the back board or plate having been removed. Fig. 5illustrates a face view of a portion of the shutter, showing thetoggle-levers in the position they occupy during the return stroke ofthe engine after an instantaneous exposure has been made.

A illustrates the front plate of the shutter, which is preferably madeof metal, but may, however, be made of any suitable material. It isattached to the back board or plate by screws B B in the usual manner orby other suitable means. On the interior of the case there are in thepresent instance four wingsor slides, which are clearly illustrated indotted lines in Fig. 4 and are numbered, respectively, 1, 2, 3, and 4, 1and 4 being the outside wings and 2 and 3 the inside wings. They may bearranged in such manner as preferred, but in the present instance areshown all pivoted upon a single pivot C, (see Fig. 4,) and the pin whichactuates them is shown at D. This pin is connected to a perforated plateE and works through slots shown in the wings or slides in the usualmanner. The plate E is pivoted to the case at F. (See Fig. 4.) The pin Gis merely a guide or a centering-pin used to aid in adjusting the backboard or plate upon the shutter-case proper.

H is the pneumatic engine, which is preferably made of metal, as usual,and is provided with the usual rubber tube-I, which connects with abulb.

J is the piston of the engine. It has a link K pivoted to it, as shown,which in turn engages with one end of a lever L, which is piv* oted tothe case of the shutter at M. The other end L of this lever is providedwith an enlarged terminal in which there is a slot N, ofsubstantially-rectangular form, in which works a pin 0, which isconnected to one end of another lever P. This leverP is connected by apivot Q to the perforated plate E, passing through a slot R, made in thefront board or case A.

S (see Fig. 4) is a guide and support for the perforated plate E,consisting of an overlapping piece of metal riveted to the front of thecase, as shown. Its function is to support and holdsnuglyin position thefree edge of the plate E.

It will be noted that in Figs. 1 and 3 the wings appear differently ondifferent sides of the lens-opening. This is suggestive of irregularityin their shape and perhaps defect in their arrangement; but it is notso.

has been found that the wings in this shutter, as well as in certainothers of similar construction, work better when they are arranged inregular series in contradistinction to being arranged in pairs.Therefore in said Figs. 1 and 2 of the drawings the wings are shown asarranged in regular series4, 3, 2, 1-4 being the uppermost one or thatnearest the observer, and the others in succession arranged behind oneanother. This feature is, however, not at all essential to theinvention, and therefore in Fig. 4 the wings are shown arranged inpairs, as usual, whereby symmetry in their outline is observable.

The operation of the apparatus is obvious. As stated, the normal orprimary position of the parts is shown in Fig. 1. Now to take asnap-shot or make a so-called instantaneous exposure the bulb issqueezed, whereby the piston of the engine is projected so that the pinmoves from its position, as shown in Fig. 1, into the upper part of therectangular or bayonet-joint slot N, and as the lever L moves toward thehorizontal position, as shown in Fig. 2, the straightening of the twotoggle-levers L and P necessitates movement of the lever I to the right,as shown in Fig. 2, so that instead of the pin Q (which is connectedwith the plate E) resting at the left hand end of the slot B it is movedto or beyond the center of said slot, thus conveying a sliding movementto the plate E. Consequently through the actuatingpin D the wings aremoved and caused to open, as shown in Fig. 2. Upon further upwardmovement of'the piston the parts leave the position shown in Fig. 2 andacquire that shown in Fig. 3that is to say, the end L of the leverhaving passed beyond the center the toggles are flexed again, so thatthe pin Q, is drawn inwardly, causing a reverse movement of the plate E,whereby the wings or slides are again closed. Upon relaxing the bulb thesuction draws the piston back into the cylinder, so that the lever L Lmakes a reverse movement; but when going in this direction no thrust isexerted upon the lever P and the pin Q, although that lever is rockedupon the pin Q, because the pin 0 on the end of the lever during thismovement of the parts slides forwardly, as shown in Fig. 5, into thehorizontal section of the rectangular or bayonet-joint slot, the motionbeing lost in this manner, and these parts return to their primarynormal position without movement of the wingsor slides. To make a timeexposure, means are provided to arrest the movement of the levers whenthey attain the position shown in Fig. 2-that is to say, when the,shutter is fully open. Any suitable means may be employed for thispurpose. A serviceable one is shown in the pin T, which is adapted to beprojected into the path of a hook U upon the lever P, as shown in Fig.2.

Its movement is effected by pushing the knob T inwardly and outwardly.It is supported by the case and slides through a little slot madetherein.

It will be obvious to those who are familiar with this art thatmodifications may be made in the details of construction of the partsillustrated and described without departing from the essentials of theinvention. Therefore the invention is not limited to such details.

Having described the invention, what is claimed is- 1. The combination,in a shutter, of togglelevers, one of which is pivoted to theshuttercase and connected with the piston of the en gine, the otherpivoted upon an oscillating lever which actuates the-wings, for thepurposes set forth.

2. In a shutter, the combination of togglelevers, one of which ispivoted upon the shutter-case and connected with the piston of theengine, the other being pivoted upon an OS cillating lever whichactuates the wings, and means to arrest the movement of the levers whenthe wings are fully open, for the pui poses set forth.

3. The combination in a shutter of togglelevers one of which isconnected with the piston of the engine and the other with the meanswhich actuates the wings, the levers being connected to each other by apin-and" slot connection whereby lost motion is permitted when the partsmove in one direction, for the purposes set forth.

4. In a shutter the combination of togglelevers, one of which isconnected with the piston of the engine and the other with the meanswhich actuates the wings, the levers being connected to each other by apin and bayonet-joint slot, whereby lost motionis permitted when theparts move in one direction, for the purposes set forth.

5. In a shutter the combination of toggle levers, one of which ispivoted to the case of the shutter and connected with the piston of theengine by a pivoted link, and the other pivoted to the means whichactuates the wings, the levers being connected to each other by meanswhich permit lost motion when the parts move in one direction, for thepurposes set forth.

6. In a shutter the combination of togglelevers, one of which is pivotedto the case of the shutter and connected to the piston of the engine insuch a manner as to compensate for the swing of the lever, the otherbeing pivoted to the means which actuates the wings, the said leversbeing connected to each other in such manner that lost motion ispermitted when they move in one direction, for the purposes set forth.

7. In a shutter the combination of togglelevers, one of which is pivotedto the case of the shutter and connected to the piston of the engine insuch a manner as to compensate for the swing of the lever, the otherbeing piv- TOO IIO

vulv -vvv U mazoo and State of Michigan, this 4th day of November, 1899.

WILLIAM SHAKESPEARE, JUNIOR.

oted to the means which actuates the Wings, the said levers beingconnected to each other in such manner that lost motion is permitted toarrest the movement of the levers when the Wings are fully opened, forthe purposes set forth.

Signed at Kalamazoo, in the county of Kala- Aclmin istvatrim of GarrettW. Low, deceased.

Witnesses:

CORA lVI. SHAKESPEARE,

EDITH SHAKESPEARE.

when they move in one direction, and means I MARY E, LOW,

